If your roommate left something on the stove and it started getting too hot

If it's something that's actually cooking, you could say "your [X] is starting to boil, is it supposed to?" Or "the pot on the stove is boiling over". If it's something they wanted to preheat but forgot about, you could same something like "um, the frypan is smoking" or "I think the [X] is overheating". If you have a really good relationship, you could jokingly say something like "are you trying to burn down the kitchen?".

I’d say, you’d better check on the stove.

Depends what it is. For something solid you'd say "overheating" or "burning." For a liquid you'd say "boiling over," e.g. "your hot water is boiling over!"

I would say, Hey, are you going to check on your food on the stove? I think it’s burning / boiling over (pasta water). Dragging your roommate by the sleeve was an appropriate action if you lacked all those words.

Just as your title states would be fine.

Shit's on fire, yo

Dragged her because you couldn't use your words? "Hey, are you watching this? It's burning/ overcooking, should I shut it off?"

Did you forget about your pot on the stove? I think your food on the stove is about to burn. I think your pot’s about to boil over. Do you want me to turn off the burner for you? Can you go check your pot on the stove before it burns/boils over?

If it happened to me: (1) Turn off the burner! (2) “Your <thing you were cooking> is about to burn!!” [So come and deal with it.] (3) Explanations (4) Recriminations (5) Apologies (6) Dinner (7) 📺

"Your [whatever] is burning"

Hey you left the stove on! Your food is burning! The pot is boiling over! Dude, your food!

hahahah. Maybe this" Hey.... you forgot to turn off the stove". I am not native.

Better get your arse back in the kitchen.